Made of nuts soaked in PAI CRISTAL ITALIA abrasives, ready to use. Use: After a long use of the granules, add 0,2 to 0,3 % of the composant?s weight in order to re-establish a cutting capacity to the mixture. It is important to chose the appropriate cutting capacity (see page before) and the adequate grain size depending on the pieces that are being polished. Minimal packing: 10 kg. The original packaging is 25 kg. Different grain sizes on demand.